Draft-gear



H. BARNARD.

DRAFT GEAR APPLICATION mu) DECMJ, my.

W 0 Q n Ng m m m 4 m s r m a H. BARNARD.

DRAFT GEAR.

APPLICATION FILED DEC. 9,1919.

Patented Oct. 19, 1920.

2 SHEETSSHEET 2.

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HARRY BARN/ARE, OF CHICAGO, ILLINOIS, ASSIGN'OR T0 UNION DRAFT GEAR ('20., A CORPORATION OF ILLINQIS.

DRAFT- GEAR.

Specification of Letters Fatent.

Patented Oct. 19, 1920.

Application filed December 9, 1919, Serial. No. 343,676.

To all whom it may concern:

Be it known that I, HARRY BARNARD, a citizen of the United States, and resident of Chicago, county of Cook, and State .of Illinois, have invented certain new and useful Improvements in Draft-Gears, of which the following is a specification and which are illustrated in the accompanying drawin'gs, forming a part thereof.

This invention relates to mechanism for transmitting draft and buffing stresses to the draft arms of a car frame, and has as an object the provision of a mechanism of this nature that will act effectively in especially heavy service.

An illustrative embodiment of the invention is shown in the accompanying drawlngs, in which-- nected to a yoke 16 in the usual manner. A

plate 17 is shown connecting the draft sills and acting as a carry iron for the yoke 16.

The mechanism shown for transmitting the stresses to the draft and bufiing lugs, and for acting as a cushion between the coupler and yoke and the lugs, is a modification of the well known Cardwell friction gear. The front and rear follower blocks 18 and 19 serve as friction casings in the usual manner. The present invention comprises the provision of a central friction casing, as 20, shown as having two chambers 21 and 22 opening in opposite directions for reception of the friction apparatus. Each of the follower friction casings 18 and 19 has an open-sided chamber corresponding to the chambers 21 and 22.

The friction apparatus comprises a plurality of like mechanisms, each of which, as shown, includes the bolt 23, springs 24', 25, wedges 26, 27, central wedge 28, and end wedges 29, 30, 31, and 32. The end wedges friction casings above described. The action of the friction devices shown is well known.

As shown, each central wedge 28 has a longitudinal rib, as 33, 84 located one at its top and one at its bottom edge, which ribs are received and guided in grooves, as 35 and 36, in each chamber of each friction casing.

The outside of the casing opposite the grooves 35, 36, is shown as'raised into a rib thus strengthening the walls of the grooves and providing a surface which coacts with the inner surface of the yoke to keep the casing 20 centered.

The interior of the yoke preferably has a length erfiial to the separation of the draft and bufling lugs, and the springs 25 are normally under pressure, whereby the wedges will hold the front and rear friction case follower blocks 18 and 19 extended to fill the yo e.

Both the end and central friction casings are preferably formed with channels, as 37, for the purpose of lightening the structure.

I claim as my invention- A draft gear comprising, in combination, a plurality of sets of friction elements each set including a central wedge member having a longitudinal rib on each of its upper and lower edges, a forward and a rearward friction casing associated each with an end of the combined named sets, each casing having guiding grooves for said ribs, an intermediate friction casing associated ;with adjacent friction elements comprising a box-like member having op positely open ends for reception of said sets of elements, the upper and lower wallshaving guiding grooves for said ribs, spaced walls crossing the middle of said intermediate friction casing, strengthening centered.

HARRY BARNARD. 

